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network is also unreliable because there is no way to ensure the information reached its destination A connection-oriented network is slow (in comparison to a connectionless network) because of the extra dialogue involved, but it guarantees the data sequence, providing end-to-end reliability The IP element of the TCP/IP and UDP/IP protocols refers to the Internet Protocol, which is a set of standards for specifying the individual addresses of machines within a network Each machine within the networking world has a unique IP address This is made up of a sequence of four bytes typically written in dot notation, for example, 1981029145 These numbers relate both to individual machines within a network and to entire collections of machines Because humans are not very good at remembering numbers, a system called DNS (Domain Name System) relates easy-to-remember names to IP addresses For example, the name wwwmcgraw-hillcom relates to a single IP address You can also have a single DNS name pointing to a number of IP addresses, and multiple names point to the same address It is also possible to have a single machine that has multiple interfaces, and each interface can have multiple IP addresses assigned to it However, in all cases, if the interfaces are connected to the Internet in one form or another, then the IP addresses of each interface will be unique However, the specification for communication does not end there Many different applications can be executed on the same machine, and so communication must be aimed not only at the machine, but also at a port on that machine that relates to a particular application If the IP address is compared to a telephone number, the port number is the equivalent of an extension number The first 1024 port numbers are assigned to well-known Internet protocols, and different protocols have their own unique port number For example, HTTP (Hypertext Transfer Protocol), which is used to transfer information between your web browser and a web server, has a port number of 80 To connect to a server application, you need both the IP address (or machine name) and the port number on which the server is listening The BSD (Berkeley Systems Division, which is a flavor of Unix) socket system was introduced in BSD 42 as a way of providing a consistent interface to the different available protocols A socket provides a connection between an application and the network You must have a socket at each end of the connection in order to communicate between the machines One end must be set to receive data at the same time as the other end is sending data As long as each side of the socket connection knows whether it should be sending or receiving information, then the communication can be two-way There are many different methods for controlling this two-way communication, although none is ultimately reliable The most obvious is to best-guess the state that each end of the connection should be in For example, if one end sends a piece of information, then it might be safe to assume it should then wait for a response If the opposite end makes the same assumption, then it can send information after it has just received some This is not necessarily reliable, because if both ends decide to wait for information at the same time, then both ends of the connection are effectively dead Alternatively, if both ends decide to send information at the same time, the two processes.

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And two command-line invocations:

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will not lock; but because they use the same send-receive system, once they have both sent information, they will both return to the wait state, expecting a response A better solution to the problem is to use a protocol that places rules and restrictions on the communication method and order This is how Simple Mail Transfer Protocol (SMTP) and similar protocols work The client sends a command to the server, and the immediate response from the server tells the client what to do next The response may include data and will definitely include an end-of-data string In effect, it s similar to the technique used when communicating by radio At the end of each communication, you say Over to indicate to the recipient that you have finished speaking In essence, it still uses the same best-guess method for communication Providing the communication starts off correctly, and each end sends the end-ofcommunication signal, the communication should continue correctly Although generally thought of as a technique for communicating between two different machines, you can also use sockets to communicate between two processes on the same machine This can be useful for two reasons First of all, communicating between processes on a single machine (IPC interprocess communication) allows you to control and cooperatively operate several different processes Most servers use IPC to manage a number of processes that support a particular service We ll be looking at the general techniques available for networking between processes, either on the machine or across a network to a different machine Techniques include those using the built-in Perl functions and those using modules available from CPAN that simplify the process for communicating with existing protocol standards If you want more information on networking with sockets and streams under TCP, UDP, and IP, then I can recommend The UNIX System V Release 4 Programmers Guide: Networking Interfaces (1990, Englewood Cliffs, NJ: Prentice Hall), which covers the principles behind networking, as well as the C source code required to make it work.

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